Dangerous sports invented by the British

Although fighting with the fists is an ancient sport, boxing as we know it was
developed in Britain in the Victorian period.

To try and prevent deaths in the ring, bareknuckle fighter Jack Broughton
brought in a set of guidelines known as "The Broughton Rules" –
which included the provision that if a fighter went down and did not recover
after 30 seconds, the game was over. Nonetheless, the game still carries
significant risks of injury, especially to the brain.